Hyundai Tucson Hybrid check engine light comes on

Filed Oct 20, 2026 · Transmission · NC

Suspect faulty TCU or associated software: My 2026 Tucson Hybrid, purchased in February, has an intermittent “Shift-by-Wire (SBW)” fault where the car refuses to shift into gear (e.g., Reverse) and displays “The car is already in the desired gear” warning on dashboard and the Check Engine light comes On. Retrying (turn car off, wait a while and restart) generally resolves the immediate issue and the Check Engine light turns Off. However, I don’t feel safe driving the car until a definitive warranty repair can be done. So, I had it towed to the dealer. The dealer showed me screen shots of their initial scan indicating No DTC codes were found, that they could not duplicate the problem, and I could pick the car up. If the Check Engine light came on there should be a DTC code stored in non-volatile memory, right? I asked the dealer to keep the car and have a technician drive it until they duplicate and fix the problem. They agreed but I have evidence that indicates the car is not being driven. I filed a formal consumer complaint with Hyundai Corporate Customer Care and received a Case Number (43328121) but no other communication in the weeks since.

Filed Sep 7, 2026 · Electrical · TN

My instrument cluster goes completely blank while driving the vehicle. It will also have every light come on when it does come back on all of the check engine lights, and every other diagnosis light comes on. It continues to do this while driving. I have already had the safety recall done and it is still failing.

Filed Aug 19, 2026 · Driver assistance, Engine · MA

System/Component Failed & Inspection: The vehicle suffers from recurring failures across the engine, powertrain, electronic throttle control, and exhaust gas recirculation (EGR) control systems (DTCs P0524, P0642, P2118, P022100). The vehicle is fully available for inspection upon request. Safety Risk: While driving, the vehicle suffered a complete, sudden loss of motive power on an active highway entrance ramp. The engine stalled in moving traffic with zero throttle response, creating an immediate collision hazard before requiring a tow. Confirmation by Dealer: Technicians formally confirmed these defect patterns. In May 2026, diagnostics logged major engine and emission/EGR control codes, but corporate refused goodwill repair. In August 2026, the highway stall recurred. Diagnostics confirmed active low oil pressure and throttle failure codes, which the dealer resolved by applying 4 factory ECU software updates under TSB 25-01-010H. Service personnel explicitly confirmed these engine control issues are manufacturing defects, not wear-and-tear or mileage-related. Inspections: Inspected, diagnosed, and serviced by authorized dealership service department technicians during both the May and August 2026 failure events. Warning Symptoms & History: Engine issues began at 341 miles when purchased new (settled). In May 2026, check engine lights returned with diagnostic codes for engine and EGR/emissions systems. In August 2026, total power loss occurred, preceded by check engine, forward collision camera, and radar sensor warnings.

Filed Aug 4, 2026 · Engine · MI

I am reporting a critical Exhaust Gas Recirculation (EGR) valve and electrical circuit failure on my 2022 Hyundai Tucson Hybrid. The failure resulted in the check engine light illuminating, diagnostic codes identifying an EGR system malfunction, and visible corrosion found within the EGR connector and extension harness. This component breakdown causes severe performance risks, risk of sudden loss of engine power, and compromises vehicle safety. Diagnostic & Technical Details: Error Codes Captured: Diagnostic trouble codes in the P0400 series (EGR system flow/circuit malfunction) along with connector/wiring degradation were confirmed during inspection. Root Cause & Symptoms: The failure stems from degradation and electrical shorting risks in the EGR valve assembly and its immediate wiring harness connection. Manufacturer Response & Escalation Denial: When addressing this failure, I discovered that Hyundai has acknowledged widespread EGR valve assembly defects, electrical short risks, and solder flux contamination issues across multiple model years and production lines (such as the federal safety agency Campaign 24V‑308 and subsequent service campaigns like 9B3). However, Hyundai restricts safety recall and warranty coverage strictly based on narrow VIN manufacturing parameters, leaving owners with identical, failing hardware to shoulder exorbitant out-of-pocket repair costs—in my case, quoted at over $2,013. Because a compromised EGR system and corroded electrical harness can cause sudden engine performance failures while driving in traffic, and because Hyundai is limiting its accountability through arbitrary production windows, I am requesting that the federal safety agency investigate this systemic EGR and harness failure on 2022 Tucson Hybrid models and compel Hyundai to expand its safety coverage and reimburse affected owners for necessary repairs.

Filed Jul 29, 2026 · Engine, Fuel system · VA

On XXX the vehicle lost motive power while my wife was accelerating to merge onto a highway with our two young children aboard. It would not accelerate and she was forced to pull over in an active merge area. Simultaneous warnings illuminated: Electronic Parking Brake, ESC, Forward Collision Avoidance, Blind Spot Detection, and hybrid system, with "Check Hybrid System" displayed. No crash or injury occurred, but loss of propulsion during a highway merge created serious collision risk. This is a recurring defect documented since early 2023: Hyundai's own Blue Link telematics auto-flagged an Engine Control System DTC on XXX; a jump-start was required XXX (dealer RO #XXX); check engine light and stored CAN-bus codes U100387, U100100, U004600, U010100 on 08/10/2023 (RO #XXX); and a September 2023 incident in which the center display shut off during reverse, disabling the backup camera. Hyundai performed Service Campaign 9B4 (BMS software update, DTC P1BB20, TSB 25-01-010H-1) on this VIN on XXX; the same failure category recurred 84 days later. The vehicle was towed to Safford Hyundai of [XXX] onXXX and has remained there 65+ consecutive days. The dealer replaced the 12V battery (defect persisted) and the Hybrid Power Control Unit (HPCU); per Hyundai Consumer Affairs' own written email ofXXX, the check engine light returned after the HPCU replacement and the cause "remains unidentified." The dealer states it cannot determine the root cause. The vehicle IS available for inspection at Safford Hyundai of Springfield, [XXX]. Five Hyundai Consumer Affairs cases exist on this VIN (current: #XXX). INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 24, 2026 · Brakes, Driver assistance · MI · crash

While driving my 2024 Hyundai Tucson Hybrid at approximately 20-25 mph approaching a red light, a sudden and total loss of brake power-assist occurred. Upon applying the brakes, the pedal became instantly rigid and rock-hard. Despite pumping the pedal multiple times and applying heavy manual foot pressure, the vehicle failed to stop, resulting in a low-speed rear-end collision with a stationary car stopped at the traffic light. No dashboard warning lights or malfunction indicators illuminated during or immediately following the event. After the collision, the vehicle's ignition was turned off and then restarted. Following this power cycle, normal braking functionality temporarily returned. The low-speed impact displaced an ultrasonic sensor in the front bumper. This intermittent electronic brake failure poses a catastrophic safety hazard to pedestrians and occupants if it recurs at higher speeds

Filed May 26, 2026 · Driver assistance · MD

The rearview camera system on my vehicle intermittently and unpredictably malfunctions when shifted into reverse. Instead of displaying the live rear camera feed, the infotainment screen abruptly turns entirely green or blue, completely obscuring the rearward view. Component that failed: The rearview camera system and/or the main infotainment display module. The components are currently on the vehicle and available for inspection upon request. Safety risk: This failure severely compromises safety by eliminating critical rear visibility while backing up. The sudden loss of the camera feed creates a significant blind spot, increasing the risk of backing into a pedestrian, a moving object, or another vehicle, especially in busy parking lots or residential driveways. Dealer confirmation: Yes, this is a persistent defect that has been reproduced, confirmed, and documented by an authorized dealership service center during multiple service visits. Despite the dealer and the manufacturer being informed of this defect over two months ago, neither has been able to successfully repair the vehicle or provide a permanent fix. Inspected by others: The vehicle and the malfunctioning components have been inspected by the manufacturer’s authorized dealer technicians during multiple attempts to diagnose and repair the ongoing issue. Warning lamps/symptoms: There are no warning lamps, check engine lights, or error messages on the dashboard prior to or during the failure. The sole symptom is the immediate and spontaneous green or blue screen takeover on the center display precisely when the vehicle engages the reverse gear.

Filed Oct 2, 2025 · Transmission · PA

I purchased a brand new vehicle with only 12 miles on it. Less than 72 hours later I had to have it towed. I turned the vehicle on and tried to put it in drive and 2 error messages came up. One was the check hyrid system and the other was a check engine. The diagostic tool on the car says it is related to transmission. The dealership doesnt have time to look into it yet and the Manager from the dealership I bought it from offered no solutions since I travelled home to another state.

Filed Sep 9, 2025 · Airbags, Brakes · TX

All warning lights and audible alarms started going off at the same time. EPS, ABS, Auto Hold, Collision warning, Air bags, All wheel drive, brake system, and more.1st time it happened was [XXX], while driving. The car was drivable but I did notice a difference in braking and acceleration. I parked and turned off the car. I did turn the car back on several times and the alarms continued. I finally turned it off for 10 min, and all alarms stopped, but the check engine light stayed on. Car sat overnight and all warnings had stopped. Took it in for service, and issue could not be duplicated. 2nd time it happened was [XXX]. I had to have the car towed since it would not move when in drive or reverse. Alarms were still going off when it made it to service. They replaced the brake harness. 3rd time happened on [XXX], 3 days after the brake harness was replaced. Towed it to service and they replaced the engine harness. 4th time was on [XXX], 2 weeks after engine harness was replaced. This time there were no audible alarms, just all of the visual ones. Same performance issues as stated before. This issue seems to have happened to several other Hyundai owners as well, as per complaints in Reddit and on Hyundai forums. There does not seem to be a consensus for what is actually causing this issue. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 1, 2025 · Acceleration, Driver assistance · CA

I purchased a brand-new Hyundai vehicle on [XXX] from Dublin Hyundai. Since purchase, the vehicle has exhibited repeated, serious defects that compromised the safety of my [XXX] baby and family. Timeline of Events: [XXX] – Vehicle purchased new. Safety concerns arose within weeks of ownership. July 16, 2025 – Vehicle dropped off for major issues: camera display failures, heads-up display malfunctions, and random security errors. Vehicle remained in service for over two weeks. August 2, 2025 – Returned with the check engine light on and a scratch on the deck. August 3–4, 2025 – Dropped off again; dealership instructed that the fuel level must remain between 50–70%. August 11, 2025 – Dropped off again; a loaner vehicle provided was unsafe — gear shift failure, body control system errors, infotainment failure, and inability to lock the vehicle. This put my baby’s safety at direct risk as the loaner could not be secured or reliably driven. August 19, 2025 – Vehicle returned with new scratches and multiple issues still unresolved. Late August 2025–Present – Vehicle was relocated to San Jose without my consent. I only know its location from the Hyundai app, which frequently alerts: “Battery level is below normal. Please check that vehicle lights and accessories are switched off to avoid battery drain.” I have not been provided proper updates from Hyundai or the dealership. Safety Risk: Repeated mechanical and electronic failures in both the new vehicle and the loaner. Vehicle is unreliable, unpredictable, and unsafe for transporting a young child. Manufacturer and dealer have failed to provide a safe, operable vehicle despite multiple repair attempts. I am filing this complaint because these issues pose a serious safety risk to me, my infant child, and other drivers on the road. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)